Gearing mechanism



www5

Sept. l, i923.

A. 1 STEWART ET AL GEARING MECHANI SM 1920 2 Sheets-Sheet 1 Original Filed Oct. 14

w w. l@ u A m www NTN

T 7 nik Sept. 11, 1923.. www@ A. L. STEWART`ET AL f GEAR'ING 'MECHANISM originaL/Filed oct, 14. i920 2 sheets-sheet 2 y K Mew 9g l um zfzzehrw XMIM/027m INVENTORS MWA TToRNEY f Patented Sept. 11, 1923.

narran treinta narrar ortica,

ARTHUR L. STEWART AND EYVIND FINSEN, OF ROCHESTER, NEW YORK, ASSIGNORS TO GLEASON WORKS, OF ROCHESTER, NEVI YORK, A CORPORATION OF NEW YORK.

GEARING lVIECHANISM.

Original application filed October 14, 1920, Serial No. L16,975, now Patent No. 1,403,526, dated January 17, 1922. Divided and this application iled August 9, 1921.

To all whom t may concern:

Be it known that we, ARTHUR L. STEWART and EYviND FiNsnN, citizens of the United States of America, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Gearing Mechanism, of which the following is a specification.

The invention relates to gearing mechanism and has for its object to afford a simplified and ecient construction particularly applicable to gear cutting machinery, and designed to alternately operate a shaft in opposite directions, from a driving shaft turning continuously in one direction, this application being a division of application Serial N o. 416,975, filed Oct. 14, 1920, now Patent No. 1,403,526, J an. 17, 1922.

One of theprincipal objects of the invention is to afford an arrangement whereby the driven shaft, which alternately reverses its motion, operates at one speed in one direction and at a different speed in the other direction.

Another purpose of the improvement is to accomplish the operation of a driven shaft at different speeds in opposite directions by means of independent sets of gearing between a driving and driven shaft, one set of gearing being changeable to effect different slow speeds and the other set of gearing being constant and preferably affording a fast speed.

,n Still a further obj ect of the invention is to afford a practicable and eilicient arrange ment of parts for effecting the continuous rotation of an element in one direction from a shaft which alternately travels in opposite directions.

The invention also includes certain details of construction, all of which will be clear from the following` description, when read in conjunction with the accompanying draw ings, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a sectional view of a mechanism embodying the invention, as applied to a gear cutting machine such as disclosed in the aforesaid original application.

Figure 2 is a diagrammatic View showing the general arrangement of gearing for operating the parts of a gear cutting machine Serial No. 490,942.

of the type to which this invention is applicable, and

Figure 3 is a detail view in elevation.

In a gear cutting machine of the type to which the present invention is applicable, the gear blank is turned first in one direction and then in the other, the cutter support being` also turned bodily rst in one direction and then in the other, to effect relative rolling or bodily movement during cutting, and these motions are transmitted to the respective parts of the machine by a reversing shaft designated at 1, and which rotates alternately in opposite directions.

rlhe reversing or driven shaft 1 is operated from a driving shaft 2, which is actuated through suitable gearing from a main driving pulley 3, see Figure 2. The automatic reversing mechanism which connects shaft which is controlled by the reversing l mechanism, travels at the same speed in both directions, with the result that when applied to a gear cutting machine, the tool and blank must trave-l at the same speed when they are in cutting relationship and when out of cutting relationship, and one of the acco1nplishments of the present construction is to increase the speed of the apparatus by increasing the speed of the parts when not in cut ting relation, as for instance during the returning, indexing and feeding motions, during which the blank is moved away from the cutter, given a partial rotation to present another surface to the tools, and then returned to the cutter, this being brought about by causing the driven shaft 1 to travel fast in one direction and slow in the other direction, the slow speed taking place during the cutting operation and the fast speed taking place when the tools and blank are out of cutting relationship.

The relatively fast motion of the shaft 1 is imparted from shaft 2 through gears Li and 5, while the relatively slow motion is imparted through gears 6, 7, 8 and 9. The gears 5 and 9 are fixedly connected to the respective sleeves 10 and 11, see Figure 1, which are alternately locked to the driven shaft 1 by reversing mechanism such as disclosed in said previously mentioned patent.

rfhe gears 6, 7, 8 and 9 constitute change gears which can be replaced by other sets of change gears as desired, in order to vary the speed of the shaft 1 during the cutting operation of the machine, in accordance With the nature of the Work, the character of the cut, and other conditions which must be taken into consideration in a metal Working machine, and Which vary for different classes of Work.

The gears 1- and 5, are not changeable, but are intended to be permanently arranged so as to give a maximum speed to the driven shaft 1 and thereby impart a maximum speed to the several parts of the apparatus during the returning, indexing and feeding motions, that is, iv ile the tool and Work are out of cutting relationship, this speed being preferably constant for all `classes of Work. In prior gear cutting machines, when it was necessary to modify the 'cutting speed. to make it slower, it also necessarily required slowing the speed of the machine during the returning, indexing and feeding motions, thus greatly reducing the speed of the complete operation, Whereas with the present invention, any necessary slowing of the machine affects only 'the actual cutting operation, Without reducing the speed of the partsl When out of cutting relationship, and thus a maximum speed can be maintained for returning, indexing and feeding, irrespective of the cutting speed.

Referring to Figure 2, the cutter is designated diagrammatically at 10, and is driven continuously in the same direction from the main power shaft 11 through the indicated gears. The cutter 10 is mounted on a'cradle or support Which is oscillated, as fully set forth in said original applica- 12, the latter being operin opposite directions versing shaft 1.

The gear blank or Work is turned sloivly in one direction during the cutting operation, and fast in the other direction during the returning, indexing and vfeeding motions, and this is accomplished by the Worm 13, which is driven in one direction from shaft 14 and in the other direction from shaft 15 through the indicated'gears, all as fully set forth in said original application. The gear blanlr or Work is moved back and forth toward and from the cutter lso as to Withdraw it from cutting position indexing and this is accomto permit 16 fixed on a spindle plished from a Worm 17, and operating continuously in one direction from the reversing shaft 15, through a mechanism which converts said alternate reversing motion into a continuous motion, and which will noiv be described more fully.

The shaft 15 Which is operated from the shaft 1, and has a similar reversing motion, carries fixed thereon a gear 18, engaging a gear 19, which is loosely arranged on the actuated element or spindle 17. Also loosely aranged on the spindle 17 is a bevel gear 20, while 21 is a second bevel gear keyed to the spindle' 17. 22 designatesan idler gear journaied on an arbor 23 and having engagement with the gears 2O and 21. rlhe gears 2O and 21 are arranged on suitable sleeves having inclined clutch surfaces 24 and 25 on their djacent faces, and 2G is a slidable device, preferably consisting of a pin carried by the gear 19` and cooperating alternately with the clutch faces 2a and 25. As the drive shaft 15 travels in one direction and then in the other, the gear 19 has a corresponding reversing motion and as the pin 26 is arranged to lock with one or the other of the clutch faces 211 and 25, the latter are Y alternately driven by gear 19. As the gear 19 reverses, the pin 26 is forced to itsopposite position by the inclination of the clutch face With Which it is 'then engaging. Vheu the bevel gear 2O is being driven by the gear 19, it turns loosely on the actuated element or spindle 17 and operates the same through idler 22 and gear 21, Whereas When bevel gear 21 driven by the gear 19, vit carries. With it the actuated element 17. Thus the latter is always rotated in the same direction, but at varying speeds, corresponding to the speeds ofthe opposite motions of the reversing shaft 15.

7e claim:

1. The combination with a reversing shaft and an element operated thereby, of a gear fixed on said element, a second gear rotatively mounted on said element, an idler gear connecting the aforementioned gears, a third gear rotatively mounted on said element, a gear fixed on said reversing shaft engaging said third gear, cam surfaces on the adjacent faces of said first mentioned fixed and rotatively mounted gears, and means carried by the third gear and acting automatically to engage and drive said fixed and rotatable gears alternately, said means comprising a device slidably mounted on said third gear and cooperating alternately with said cam surfaces.

2. The combination with a reversing shaft and an element operated thereby, of a gear fixed on said element, a second gear rotatively mounted and arranged coaxially of said element, an idler gear connecting the aforementioned gears, a member operated by the reversing shaft and arranged coaxially of said element, and a device slidable back and forth on said member and cooperating alternately with the adjacent gears to rotate the same in o-pposite'drections.

3. The combination with a worm for effecting movement of a cutter support alternately in opposite directions, of a second worm for eHecting rotation of a blank support in opposite directions, a reversing driven shaft, gearing` connecting said driven shaft with said worms, a driving shaft connected with said driven shaft through reversing mechanism, and gearing between the' driving and driven shafts causing the latter to travel at a fast speed in one direction and at a slow speed in the opposite direction.

4. The combination with a continuously rotating feeding worm, of a reversing driven shaft connected with said worm through mechanism which converts the reversing motion of the driven shaft into a continuous motion of the worm, a driving shaft connected with the driven shaft through reversing mechanism, and gearing between the driving and driven shafts which causes the latter to travel at a fast speed in one direction and at a slow speed in the other direction.

5. The combination with a worm for effecting movement of a cutter support alternately in opposite directions, a second worm for effecting indexing movements of a blank, a feed worm, a reversing driven shaft operatively connected with said worms, said feed worm being connected with the reversing shaft through mechanism which converts the alternate reversing motion of the shaft into a continuous rotation of the worm, adriving shaft operatively connected with the driven shaft through reversing mechanism, and gearing between the driving and driven shafts whereby the latter is caused to travel fast in one direction and slower in the opposite direction.

In witness whereof, the parties have hereunto signed their names.

ARTHUR' L. STEWART. EYVIND FINSEN. 

